Verse-by-Verse Bible Commentary
Proverbs 18:4

Clarke's Commentary

Verse Proverbs 18:4. The words of a man's mouth — That is, the wise sayings of a wise man are like deep waters; howsoever much you pump or draw off, you do not appear to lessen them.

The well-spring of wisdom — Where there is a sound understanding, and a deep, well-informed mind, its wisdom and its counsels are an incessant stream, מקור חכמה mekor chochmah, "the vein of wisdom," ever throwing out its healthy streams: but מקור חיים mekor chaiyim, "the vein of LIVES," is the reading of eight of Kennicott's and De Rossi's MSS., and is countenanced by the Septuagint, πηγη ζωης, "the fountain of life." And so the Arabic, [Arabic]. This is the more likely to be the true reading, because the figure of the heart propelling the blood through the great aorta, to send it to all parts of the animal system, is a favourite with Solomon, as it was with his father, David. Psalms 36:9; "Proverbs 10:11", &c.

Bridgeway Bible Commentary

Real strength (18:1-24)

When people become too confident in their own opinions, they are liable to break away from former friends. They become unreasonable in discussion and blind to the viewpoints of others. Those who despise others will themselves be disgraced (18:1-3). The words of the wise bring refreshment, but those of a fool or a gossip bring destruction (4-8).
Those who leave work undone are almost as bad as those who wreck what already has been done (9). Those who trust in God know they are safe, but those who trust in their wealth only think they are safe. One day they will find that pride leads to disaster. God exalts those who willingly take the lowest place (10-12).
Strength of mind and spirit is more important in the battle of life than strength of body. The wise listen to opinions from all available sources before giving their judgment (13-15). People may try to win a judge’s favour by giving him gifts or telling him only those parts of a story that support their viewpoint. In some cases the only way a judge may be able to settle a dispute is by the drawing of lots (16-18).
People may become strong friends or strong enemies, depending on how they are treated. Words will bring a person good or ill, depending on what they mean and how they are spoken (19-21). True friendship is not easily broken, nor does it make a distinction between the richer partner and the poorer partner. But a good wife is the best friend of all (22-24).

Coffman's Commentaries on the Bible

“The words of a man’s mouth are as deep waters; The wellspring of wisdom is as a flowing brook.”

The two clauses contrast man’s teachings (the words of a man’s mouth) with the true wisdom. “Deep waters in the Old Testament are associated with the thought of darkness and mystery (Psalms 59:2; Ecclesiastes 7:24; Proverbs 20:3).”Barnes’ Notes on the Old Testament (Grand Rapids: Baker Book House, a 1987 reprint of the 1878 Edition), Proverbs, p. 52. On the other hand, the true wisdom (God’s Words) are like the happy sparkling waters of a flowing brook. Christ seems to have had this passage in mind (John 7:37-38) on that last day of the feast.

Barnes' Notes on the Whole Bible

The parallelism of the two clauses is probably one of contrast. If so, the proverb is a comparison between all teaching from without and that of the light within. “The words of a man’s mouth” are dark as the “deep waters” of a pool, or tank (“deep waters” being associated in the Old Testament with the thought of darkness and mystery; compare Proverbs 20:5; Psalms 69:2; Ecclesiastes 7:24); but “the wellspring of wisdom is as a flowing brook,” bright and clear. The verse presents a contrast like that of Jeremiah 2:13.

Smith's Bible Commentary

Chapter 18

Through desire a man, having separated himself, seeks and intermeddleth with all wisdom. A fool has no delight in understanding, but that his heart may discover itself. When the wicked comes, then comes also contempt, and with ignominy reproach. The words of a man's mouth are as deep waters, and the wellspring of wisdom as a flowing brook. It is not good to accept the person of the wicked, to overthrow the righteous in judgment. A fool's lips enter into contention, and his mouth calleth for strokes ( Proverbs 18:1-6 ).

That is, the fool's lips enters into contention, and by his mouth, the strokes is really, is blows.

A fool's mouth is his destruction, his lips are a snare of his soul. The words of a talebearer are as wounds, and they go down into the innermost parts of the belly. He also that is slothful in his work is a brother to him that is a great waster ( Proverbs 18:7-9 ).

Now Solomon has quite a bit to say about the slothful or the lazy person. The man who is lazy, slothful in his work, he's a brother to him that is a great waster.

The name of the LORD is a strong tower: the righteous runneth into it, and is safe ( Proverbs 18:10 ).

What a strong tower the name Jehovah is. How many times we have run into it to find safety.

The rich man's wealth is his strong city, and as a high wall in his own conceit. Before destruction the heart of man is haughty ( Proverbs 18:11-12 ),

That's again, "Pride goes before destruction, a haughty spirit before the fall." "Before destruction the heart of man is haughty."

and before honor is humility ( Proverbs 18:12 ).

Humble thyself; He shall exalt thee. Exalt thyself; He'll abase you. So same concept, another proverb.

He that answers a matter before he hears it, it's a folly and a shame ( Proverbs 18:13 ).

So many times we answer a person before we really understand completely what they're asking for. They're starting to explain their situation and we assume that, "Oh, yes, this is what they want to know," and we start giving out all these worthless information.

Like the little child who came in to her mother one day and said, "Mother, where did I come from?" And the mother thought, "Uh-oh, this is it. Time for the story of the birds and the bees and all." She said, "Well, honey, you go outside and play for a little while and then come on in and Mother will tell you." So she sent the little girl out and she got into this psyche books on how to explain the facts of life to your child and all and boned them all up. And then called the little girl in and sat her down and started through and explained to her the whole process of life and procreation and everything else. And she said, "Well, now, honey, do you think you understand?" She said, "Oh yes, Mommy." She said, "The little girl next door said she came from Missouri and I just wondered where I came from."

So it's possible to answer a matter before you really know what the matter is. And he that answers a matter before he hears it, it is folly and a shame to him.

The spirit of a man will sustain his weakness; but a wounded spirit who can bear? ( Proverbs 18:14 )

Oh, how hard it is when your spirit has been wounded. And yet, if you have a strong spirit, how it can bear the infirmities, the weaknesses, the sicknesses.

The heart of the prudent gets knowledge; and the ear of the wise seeks knowledge. A man's gift makes room for him, and brings him before great men ( Proverbs 18:15-16 ).

Actually, he's saying that by giving gifts you can open a lot of doors. It gives a place for you. It will bring you before great men. It actually brought me before Begin last week. I'd never be able to see Begin if we didn't have a gift for him, for Israel.

He that is first in his own cause seems just; but his neighbor comes and searches him. The lot causeth contentions to cease, and parts between the mighty ( Proverbs 18:17-18 ).

So the casting of the lot. You're arguing over this thing. Let's cast lots for it. Stops the argument. It's idea of flipping a coin, you know. Same idea. Let's flip a coin. Can't agree on something, we'll flip a coin. Heads, we will. Tails, we won't. And so it stops the contentions.

A brother who is offended is harder to be won than a strong city ( Proverbs 18:19 ):

So the idea is, don't offend your brother.

and their contentions are like the bars of a castle ( Proverbs 18:19 ).

You can't get through them.

A man's belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled ( Proverbs 18:20 ).

This is, I think, quite an important proverb, the next one.

Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof. Whoso findeth a wife finds a good thing, and obtains favor of the LORD ( Proverbs 18:21-22 ).

So Solomon found a thousand of them. He surely learned an awful lot about women.

The poor useth entreaties; but the rich answereth roughly ( Proverbs 18:23 ).

The poor man has to entreat; sort of beg.

A man that hath friends must show himself friendly ( Proverbs 18:24 ):

That's basic now. If you want to have friends, you've just got to show yourself friendly. A lot of people complain, "Oh, we don't have any friends." Well, you're not you're not showing yourself friendly. You if you're going to have friends, you've got to just be friendly.

and there is a friend [there is a special friend] who will stick closer than a brother ( Proverbs 18:24 ).

That, of course, is Jesus Christ. That's an important proverb to me. A man to have friends has to show himself friendly. But there is one friend who will stick closer than a brother. "

Dr. Constable's Expository Notes

3. Friendship and folly ch. 18

Gill's Exposition of the Whole Bible

The words of a man's mouth [are as] deep waters,.... The words of a great and mighty man; of an excellent and valuable man, as Jarchi; or of a wise man, as Aben Ezra. The doctrines which such a man has imbibed, and his heart is full of and his mouth utters, are like to "waters", pure, purifying, and refreshing; to "deep waters", which make no noise, and cannot be easily fathomed: such are the deep mysteries of grace, the wisdom of God in a mystery, spoken among them that are perfect; of which a good man makes no boast, but humbly declares; out of the abundance of his heart, his mouth speaks;

[and] the wellspring of wisdom [as] a flowing brook; there is a spring of spiritual wisdom and knowledge in him; a well of living water, springing up unto everlasting life; and from thence it flows freely and constantly; communicating itself liberally unto others, and ministering grace to the hearers, for their edification.

Henry's Complete Commentary on the Bible

      4 The words of a man's mouth are as deep waters, and the wellspring of wisdom as a flowing brook.

      The similitudes here seem to be elegantly transposed. 1. The well-spring of wisdom is as deep waters. An intelligent knowing man has in him a good treasure of useful things, which furnishes him with something to say upon all occasions that is pertinent and profitable. This is as deep waters, which make no noise, but never run dry. 2. The words of such a man's mouth are as a flowing brook. What he sees cause to speak flows naturally from him and with a great deal of ease, and freedom, and natural fluency; it is clean and fresh, it is cleansing and refreshing; from his deep waters there flows what there is occasion for, to water those about him, as the brooks do the low grounds.